Hi,
The Ubermix image has grown beyond 2Gb in the later versions.
Just as a test, I took the large file base_image.gz.aa, uncompressed it with gunzip, and then recompressed it with xz.
The original base_image.gz.aa is 2.4Gb
The file base_image.xz is 1.8Gb
The price to pay would be a longer time to create a customized Ubermix stick (xz at maximum compression is significantly slower than gzip), but would help people with downloading the image, and allow everyone to continue using smaller USB sticks.
Just a suggestion!